components/gcm_driver/gcm_account_tracker.cc - chromium/src.git - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "components/gcm_driver/gcm_account_tracker.h"

 #include <stdint.h>

 #include <algorithm>
 #include <vector>

 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "components/gcm_driver/gcm_driver.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "net/base/ip_endpoint.h"

 namespace gcm {

 namespace {

 // Scopes needed by the OAuth2 access tokens.
 const char kGCMGroupServerScope[] = "https://www.googleapis.com/auth/gcm";
 const char kGCMCheckinServerScope[] =
     "https://www.googleapis.com/auth/android_checkin";
 // Name of the GCM account tracker for the OAuth2TokenService.
 const char kGCMAccountTrackerName[] = "gcm_account_tracker";
 // Minimum token validity when sending to GCM groups server.
 const int64_t kMinimumTokenValidityMs = 500;
 // Token reporting interval, when no account changes are detected.
 const int64_t kTokenReportingIntervalMs =
     12 * 60 * 60 * 1000;  // 12 hours in ms.

 }  // namespace

 GCMAccountTracker::AccountInfo::AccountInfo(const std::string& email,
                                             AccountState state)
     : email(email), state(state) {
 }

 GCMAccountTracker::AccountInfo::~AccountInfo() {
 }

 GCMAccountTracker::GCMAccountTracker(
     std::unique_ptr<gaia::AccountTracker> account_tracker,
     GCMDriver* driver)
     : OAuth2TokenService::Consumer(kGCMAccountTrackerName),
       account_tracker_(account_tracker.release()),
       driver_(driver),
       shutdown_called_(false),
       reporting_weak_ptr_factory_(this) {}

 GCMAccountTracker::~GCMAccountTracker() {
   DCHECK(shutdown_called_);
 }

 void GCMAccountTracker::Shutdown() {
   shutdown_called_ = true;
   driver_->RemoveConnectionObserver(this);
   account_tracker_->RemoveObserver(this);
   account_tracker_->Shutdown();
 }

 void GCMAccountTracker::Start() {
   DCHECK(!shutdown_called_);
   account_tracker_->AddObserver(this);
   driver_->AddConnectionObserver(this);

   std::vector<gaia::AccountIds> accounts = account_tracker_->GetAccounts();
   for (std::vector<gaia::AccountIds>::const_iterator iter = accounts.begin();
        iter != accounts.end();
        ++iter) {
     if (!iter->email.empty()) {
       account_infos_.insert(std::make_pair(
           iter->account_key, AccountInfo(iter->email, TOKEN_NEEDED)));
     }
   }

   if (IsTokenReportingRequired())
     ReportTokens();
   else
     ScheduleReportTokens();
 }

 void GCMAccountTracker::ScheduleReportTokens() {
   // Shortcutting here, in case GCM Driver is not yet connected. In that case
   // reporting will be scheduled/started when the connection is made.
   if (!driver_->IsConnected())
     return;

   DVLOG(1) << "Deferring the token reporting for: "
            << GetTimeToNextTokenReporting().InSeconds() << " seconds.";

   reporting_weak_ptr_factory_.InvalidateWeakPtrs();
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::Bind(&GCMAccountTracker::ReportTokens,
                             reporting_weak_ptr_factory_.GetWeakPtr()),
       GetTimeToNextTokenReporting());
 }

 void GCMAccountTracker::OnAccountAdded(const gaia::AccountIds& ids) {
   DVLOG(1) << "Account added: " << ids.email;
   // We listen for the account signing in, which happens after account is added.
 }

 void GCMAccountTracker::OnAccountRemoved(const gaia::AccountIds& ids) {
   DVLOG(1) << "Account removed: " << ids.email;
   // We listen for the account signing out, which happens before account is
   // removed.
 }

 void GCMAccountTracker::OnAccountSignInChanged(const gaia::AccountIds& ids,
                                                bool is_signed_in) {
   if (is_signed_in)
     OnAccountSignedIn(ids);
   else
     OnAccountSignedOut(ids);
 }

 void GCMAccountTracker::OnGetTokenSuccess(
     const OAuth2TokenService::Request* request,
     const std::string& access_token,
     const base::Time& expiration_time) {
   DCHECK(request);
   DCHECK(!request->GetAccountId().empty());
   DVLOG(1) << "Get token success: " << request->GetAccountId();

   AccountInfos::iterator iter = account_infos_.find(request->GetAccountId());
   DCHECK(iter != account_infos_.end());
   if (iter != account_infos_.end()) {
     DCHECK(iter->second.state == GETTING_TOKEN ||
            iter->second.state == ACCOUNT_REMOVED);
     // If OnAccountSignedOut(..) was called most recently, account is kept in
     // ACCOUNT_REMOVED state.
     if (iter->second.state == GETTING_TOKEN) {
       iter->second.state = TOKEN_PRESENT;
       iter->second.access_token = access_token;
       iter->second.expiration_time = expiration_time;
     }
   }

   DeleteTokenRequest(request);
   ReportTokens();
 }

 void GCMAccountTracker::OnGetTokenFailure(
     const OAuth2TokenService::Request* request,
     const GoogleServiceAuthError& error) {
   DCHECK(request);
   DCHECK(!request->GetAccountId().empty());
   DVLOG(1) << "Get token failure: " << request->GetAccountId();

   AccountInfos::iterator iter = account_infos_.find(request->GetAccountId());
   DCHECK(iter != account_infos_.end());
   if (iter != account_infos_.end()) {
     DCHECK(iter->second.state == GETTING_TOKEN ||
            iter->second.state == ACCOUNT_REMOVED);
     // If OnAccountSignedOut(..) was called most recently, account is kept in
     // ACCOUNT_REMOVED state.
     if (iter->second.state == GETTING_TOKEN) {
       // Given the fetcher has a built in retry logic, consider this situation
       // to be invalid refresh token, that is only fixed when user signs in.
       // Once the users signs in properly the minting will retry.
       iter->second.access_token.clear();
       iter->second.state = ACCOUNT_REMOVED;
     }
   }

   DeleteTokenRequest(request);
   ReportTokens();
 }

 void GCMAccountTracker::OnConnected(const net::IPEndPoint& ip_endpoint) {
   // We are sure here, that GCM is running and connected. We can start reporting
   // tokens if reporting is due now, or schedule reporting for later.
   if (IsTokenReportingRequired())
     ReportTokens();
   else
     ScheduleReportTokens();
 }

 void GCMAccountTracker::OnDisconnected() {
   // We are disconnected, so no point in trying to work with tokens.
 }

 void GCMAccountTracker::ReportTokens() {
   SanitizeTokens();
   // Make sure all tokens are valid.
   if (IsTokenFetchingRequired()) {
     GetAllNeededTokens();
     return;
   }

   // Wait for gaia::AccountTracker to be done with fetching the user info, as
   // well as all of the pending token requests from GCMAccountTracker to be done
   // before you report the results.
   if (!account_tracker_->IsAllUserInfoFetched() ||
       !pending_token_requests_.empty()) {
     return;
   }

   bool account_removed = false;
   // Stop tracking the accounts, that were removed, as it will be reported to
   // the driver.
   for (AccountInfos::iterator iter = account_infos_.begin();
        iter != account_infos_.end();) {
     if (iter->second.state == ACCOUNT_REMOVED) {
       account_removed = true;
       account_infos_.erase(iter++);
     } else {
       ++iter;
     }
   }

   std::vector<GCMClient::AccountTokenInfo> account_tokens;
   for (AccountInfos::iterator iter = account_infos_.begin();
        iter != account_infos_.end(); ++iter) {
     if (iter->second.state == TOKEN_PRESENT) {
       GCMClient::AccountTokenInfo token_info;
       token_info.account_id = iter->first;
       token_info.email = iter->second.email;
       token_info.access_token = iter->second.access_token;
       account_tokens.push_back(token_info);
     } else {
       // This should not happen, as we are making a check that there are no
       // pending requests above, stopping tracking of removed accounts, or start
       // fetching tokens.
       NOTREACHED();
     }
   }

   // Make sure that there is something to report, otherwise bail out.
   if (!account_tokens.empty() || account_removed) {
     DVLOG(1) << "Reporting the tokens to driver: " << account_tokens.size();
     driver_->SetAccountTokens(account_tokens);
     driver_->SetLastTokenFetchTime(base::Time::Now());
     ScheduleReportTokens();
   } else {
     DVLOG(1) << "No tokens and nothing removed. Skipping callback.";
   }
 }

 void GCMAccountTracker::SanitizeTokens() {
   for (AccountInfos::iterator iter = account_infos_.begin();
        iter != account_infos_.end();
        ++iter) {
     if (iter->second.state == TOKEN_PRESENT &&
         iter->second.expiration_time <
             base::Time::Now() +
                 base::TimeDelta::FromMilliseconds(kMinimumTokenValidityMs)) {
       iter->second.access_token.clear();
       iter->second.state = TOKEN_NEEDED;
       iter->second.expiration_time = base::Time();
     }
   }
 }

 bool GCMAccountTracker::IsTokenReportingRequired() const {
   if (GetTimeToNextTokenReporting().is_zero())
     return true;

   bool reporting_required = false;
   for (AccountInfos::const_iterator iter = account_infos_.begin();
        iter != account_infos_.end();
        ++iter) {
     if (iter->second.state == ACCOUNT_REMOVED)
       reporting_required = true;
   }

   return reporting_required;
 }

 bool GCMAccountTracker::IsTokenFetchingRequired() const {
   bool token_needed = false;
   for (AccountInfos::const_iterator iter = account_infos_.begin();
        iter != account_infos_.end();
        ++iter) {
     if (iter->second.state == TOKEN_NEEDED)
       token_needed = true;
   }

   return token_needed;
 }

 base::TimeDelta GCMAccountTracker::GetTimeToNextTokenReporting() const {
   base::TimeDelta time_till_next_reporting =
       driver_->GetLastTokenFetchTime() +
       base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs) -
       base::Time::Now();

   // Case when token fetching is overdue.
   if (time_till_next_reporting < base::TimeDelta())
     return base::TimeDelta();

   // Case when calculated period is larger than expected, including the
   // situation when the method is called before GCM driver is completely
   // initialized.
   if (time_till_next_reporting >
           base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs)) {
     return base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs);
   }

   return time_till_next_reporting;
 }

 void GCMAccountTracker::DeleteTokenRequest(
     const OAuth2TokenService::Request* request) {
   auto iter = std::find_if(
       pending_token_requests_.begin(), pending_token_requests_.end(),
       [request](const std::unique_ptr<OAuth2TokenService::Request>& r) {
         return request == r.get();
       });
   if (iter != pending_token_requests_.end())
     pending_token_requests_.erase(iter);
 }

 void GCMAccountTracker::GetAllNeededTokens() {
   // Only start fetching tokens if driver is running, they have a limited
   // validity time and GCM connection is a good indication of network running.
   // If the GetAllNeededTokens was called as part of periodic schedule, it may
   // not have network. In that case the next network change will trigger token
   // fetching.
   if (!driver_->IsConnected())
     return;

   for (AccountInfos::iterator iter = account_infos_.begin();
        iter != account_infos_.end();
        ++iter) {
     if (iter->second.state == TOKEN_NEEDED)
       GetToken(iter);
   }
 }

 void GCMAccountTracker::GetToken(AccountInfos::iterator& account_iter) {
   DCHECK(GetTokenService());
   DCHECK_EQ(account_iter->second.state, TOKEN_NEEDED);

   OAuth2TokenService::ScopeSet scopes;
   scopes.insert(kGCMGroupServerScope);
   scopes.insert(kGCMCheckinServerScope);
   std::unique_ptr<OAuth2TokenService::Request> request =
       GetTokenService()->StartRequest(account_iter->first, scopes, this);

   pending_token_requests_.push_back(std::move(request));
   account_iter->second.state = GETTING_TOKEN;
 }

 void GCMAccountTracker::OnAccountSignedIn(const gaia::AccountIds& ids) {
   DVLOG(1) << "Account signed in: " << ids.email;
   AccountInfos::iterator iter = account_infos_.find(ids.account_key);
   if (iter == account_infos_.end()) {
     DCHECK(!ids.email.empty());
     account_infos_.insert(
         std::make_pair(ids.account_key, AccountInfo(ids.email, TOKEN_NEEDED)));
   } else if (iter->second.state == ACCOUNT_REMOVED) {
     iter->second.state = TOKEN_NEEDED;
   }

   GetAllNeededTokens();
 }

 void GCMAccountTracker::OnAccountSignedOut(const gaia::AccountIds& ids) {
   DVLOG(1) << "Account signed out: " << ids.email;
   AccountInfos::iterator iter = account_infos_.find(ids.account_key);
   if (iter == account_infos_.end())
     return;

   iter->second.access_token.clear();
   iter->second.state = ACCOUNT_REMOVED;
   ReportTokens();
 }

 OAuth2TokenService* GCMAccountTracker::GetTokenService() {
   DCHECK(account_tracker_->identity_provider());
   return account_tracker_->identity_provider()->GetTokenService();
 }

 }  // namespace gcm
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "components/gcm_driver/gcm_account_tracker.h"

	#include <stdint.h>

	#include <algorithm>
	#include <vector>

	#include "base/bind.h"
	#include "base/location.h"
	#include "base/single_thread_task_runner.h"
	#include "base/threading/thread_task_runner_handle.h"
	#include "base/time/time.h"
	#include "components/gcm_driver/gcm_driver.h"
	#include "google_apis/gaia/google_service_auth_error.h"
	#include "net/base/ip_endpoint.h"

	namespace gcm {

	namespace {

	// Scopes needed by the OAuth2 access tokens.
	const char kGCMGroupServerScope[] = "https://www.googleapis.com/auth/gcm";
	const char kGCMCheckinServerScope[] =
	"https://www.googleapis.com/auth/android_checkin";
	// Name of the GCM account tracker for the OAuth2TokenService.
	const char kGCMAccountTrackerName[] = "gcm_account_tracker";
	// Minimum token validity when sending to GCM groups server.
	const int64_t kMinimumTokenValidityMs = 500;
	// Token reporting interval, when no account changes are detected.
	const int64_t kTokenReportingIntervalMs =
	12 * 60 * 60 * 1000; // 12 hours in ms.

	} // namespace

	GCMAccountTracker::AccountInfo::AccountInfo(const std::string& email,
	AccountState state)
	: email(email), state(state) {
	}

	GCMAccountTracker::AccountInfo::~AccountInfo() {
	}

	GCMAccountTracker::GCMAccountTracker(
	std::unique_ptr<gaia::AccountTracker> account_tracker,
	GCMDriver* driver)
	: OAuth2TokenService::Consumer(kGCMAccountTrackerName),
	account_tracker_(account_tracker.release()),
	driver_(driver),
	shutdown_called_(false),
	reporting_weak_ptr_factory_(this) {}

	GCMAccountTracker::~GCMAccountTracker() {
	DCHECK(shutdown_called_);
	}

	void GCMAccountTracker::Shutdown() {
	shutdown_called_ = true;
	driver_->RemoveConnectionObserver(this);
	account_tracker_->RemoveObserver(this);
	account_tracker_->Shutdown();
	}

	void GCMAccountTracker::Start() {
	DCHECK(!shutdown_called_);
	account_tracker_->AddObserver(this);
	driver_->AddConnectionObserver(this);

	std::vector<gaia::AccountIds> accounts = account_tracker_->GetAccounts();
	for (std::vector<gaia::AccountIds>::const_iterator iter = accounts.begin();
	iter != accounts.end();
	++iter) {
	if (!iter->email.empty()) {
	account_infos_.insert(std::make_pair(
	iter->account_key, AccountInfo(iter->email, TOKEN_NEEDED)));
	}
	}

	if (IsTokenReportingRequired())
	ReportTokens();
	else
	ScheduleReportTokens();
	}

	void GCMAccountTracker::ScheduleReportTokens() {
	// Shortcutting here, in case GCM Driver is not yet connected. In that case
	// reporting will be scheduled/started when the connection is made.
	if (!driver_->IsConnected())
	return;

	DVLOG(1) << "Deferring the token reporting for: "
	<< GetTimeToNextTokenReporting().InSeconds() << " seconds.";

	reporting_weak_ptr_factory_.InvalidateWeakPtrs();
	base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
	FROM_HERE, base::Bind(&GCMAccountTracker::ReportTokens,
	reporting_weak_ptr_factory_.GetWeakPtr()),
	GetTimeToNextTokenReporting());
	}

	void GCMAccountTracker::OnAccountAdded(const gaia::AccountIds& ids) {
	DVLOG(1) << "Account added: " << ids.email;
	// We listen for the account signing in, which happens after account is added.
	}

	void GCMAccountTracker::OnAccountRemoved(const gaia::AccountIds& ids) {
	DVLOG(1) << "Account removed: " << ids.email;
	// We listen for the account signing out, which happens before account is
	// removed.
	}

	void GCMAccountTracker::OnAccountSignInChanged(const gaia::AccountIds& ids,
	bool is_signed_in) {
	if (is_signed_in)
	OnAccountSignedIn(ids);
	else
	OnAccountSignedOut(ids);
	}

	void GCMAccountTracker::OnGetTokenSuccess(
	const OAuth2TokenService::Request* request,
	const std::string& access_token,
	const base::Time& expiration_time) {
	DCHECK(request);
	DCHECK(!request->GetAccountId().empty());
	DVLOG(1) << "Get token success: " << request->GetAccountId();

	AccountInfos::iterator iter = account_infos_.find(request->GetAccountId());
	DCHECK(iter != account_infos_.end());
	if (iter != account_infos_.end()) {
	DCHECK(iter->second.state == GETTING_TOKEN \|\|
	iter->second.state == ACCOUNT_REMOVED);
	// If OnAccountSignedOut(..) was called most recently, account is kept in
	// ACCOUNT_REMOVED state.
	if (iter->second.state == GETTING_TOKEN) {
	iter->second.state = TOKEN_PRESENT;
	iter->second.access_token = access_token;
	iter->second.expiration_time = expiration_time;
	}
	}

	DeleteTokenRequest(request);
	ReportTokens();
	}

	void GCMAccountTracker::OnGetTokenFailure(
	const OAuth2TokenService::Request* request,
	const GoogleServiceAuthError& error) {
	DCHECK(request);
	DCHECK(!request->GetAccountId().empty());
	DVLOG(1) << "Get token failure: " << request->GetAccountId();

	AccountInfos::iterator iter = account_infos_.find(request->GetAccountId());
	DCHECK(iter != account_infos_.end());
	if (iter != account_infos_.end()) {
	DCHECK(iter->second.state == GETTING_TOKEN \|\|
	iter->second.state == ACCOUNT_REMOVED);
	// If OnAccountSignedOut(..) was called most recently, account is kept in
	// ACCOUNT_REMOVED state.
	if (iter->second.state == GETTING_TOKEN) {
	// Given the fetcher has a built in retry logic, consider this situation
	// to be invalid refresh token, that is only fixed when user signs in.
	// Once the users signs in properly the minting will retry.
	iter->second.access_token.clear();
	iter->second.state = ACCOUNT_REMOVED;
	}
	}

	DeleteTokenRequest(request);
	ReportTokens();
	}

	void GCMAccountTracker::OnConnected(const net::IPEndPoint& ip_endpoint) {
	// We are sure here, that GCM is running and connected. We can start reporting
	// tokens if reporting is due now, or schedule reporting for later.
	if (IsTokenReportingRequired())
	ReportTokens();
	else
	ScheduleReportTokens();
	}

	void GCMAccountTracker::OnDisconnected() {
	// We are disconnected, so no point in trying to work with tokens.
	}

	void GCMAccountTracker::ReportTokens() {
	SanitizeTokens();
	// Make sure all tokens are valid.
	if (IsTokenFetchingRequired()) {
	GetAllNeededTokens();
	return;
	}

	// Wait for gaia::AccountTracker to be done with fetching the user info, as
	// well as all of the pending token requests from GCMAccountTracker to be done
	// before you report the results.
	if (!account_tracker_->IsAllUserInfoFetched() \|\|
	!pending_token_requests_.empty()) {
	return;
	}

	bool account_removed = false;
	// Stop tracking the accounts, that were removed, as it will be reported to
	// the driver.
	for (AccountInfos::iterator iter = account_infos_.begin();
	iter != account_infos_.end();) {
	if (iter->second.state == ACCOUNT_REMOVED) {
	account_removed = true;
	account_infos_.erase(iter++);
	} else {
	++iter;
	}
	}

	std::vector<GCMClient::AccountTokenInfo> account_tokens;
	for (AccountInfos::iterator iter = account_infos_.begin();
	iter != account_infos_.end(); ++iter) {
	if (iter->second.state == TOKEN_PRESENT) {
	GCMClient::AccountTokenInfo token_info;
	token_info.account_id = iter->first;
	token_info.email = iter->second.email;
	token_info.access_token = iter->second.access_token;
	account_tokens.push_back(token_info);
	} else {
	// This should not happen, as we are making a check that there are no
	// pending requests above, stopping tracking of removed accounts, or start
	// fetching tokens.
	NOTREACHED();
	}
	}

	// Make sure that there is something to report, otherwise bail out.
	if (!account_tokens.empty() \|\| account_removed) {
	DVLOG(1) << "Reporting the tokens to driver: " << account_tokens.size();
	driver_->SetAccountTokens(account_tokens);
	driver_->SetLastTokenFetchTime(base::Time::Now());
	ScheduleReportTokens();
	} else {
	DVLOG(1) << "No tokens and nothing removed. Skipping callback.";
	}
	}

	void GCMAccountTracker::SanitizeTokens() {
	for (AccountInfos::iterator iter = account_infos_.begin();
	iter != account_infos_.end();
	++iter) {
	if (iter->second.state == TOKEN_PRESENT &&
	iter->second.expiration_time <
	base::Time::Now() +
	base::TimeDelta::FromMilliseconds(kMinimumTokenValidityMs)) {
	iter->second.access_token.clear();
	iter->second.state = TOKEN_NEEDED;
	iter->second.expiration_time = base::Time();
	}
	}
	}

	bool GCMAccountTracker::IsTokenReportingRequired() const {
	if (GetTimeToNextTokenReporting().is_zero())
	return true;

	bool reporting_required = false;
	for (AccountInfos::const_iterator iter = account_infos_.begin();
	iter != account_infos_.end();
	++iter) {
	if (iter->second.state == ACCOUNT_REMOVED)
	reporting_required = true;
	}

	return reporting_required;
	}

	bool GCMAccountTracker::IsTokenFetchingRequired() const {
	bool token_needed = false;
	for (AccountInfos::const_iterator iter = account_infos_.begin();
	iter != account_infos_.end();
	++iter) {
	if (iter->second.state == TOKEN_NEEDED)
	token_needed = true;
	}

	return token_needed;
	}

	base::TimeDelta GCMAccountTracker::GetTimeToNextTokenReporting() const {
	base::TimeDelta time_till_next_reporting =
	driver_->GetLastTokenFetchTime() +
	base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs) -
	base::Time::Now();

	// Case when token fetching is overdue.
	if (time_till_next_reporting < base::TimeDelta())
	return base::TimeDelta();

	// Case when calculated period is larger than expected, including the
	// situation when the method is called before GCM driver is completely
	// initialized.
	if (time_till_next_reporting >
	base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs)) {
	return base::TimeDelta::FromMilliseconds(kTokenReportingIntervalMs);
	}

	return time_till_next_reporting;
	}

	void GCMAccountTracker::DeleteTokenRequest(
	const OAuth2TokenService::Request* request) {
	auto iter = std::find_if(
	pending_token_requests_.begin(), pending_token_requests_.end(),
	[request](const std::unique_ptr<OAuth2TokenService::Request>& r) {
	return request == r.get();
	});
	if (iter != pending_token_requests_.end())
	pending_token_requests_.erase(iter);
	}

	void GCMAccountTracker::GetAllNeededTokens() {
	// Only start fetching tokens if driver is running, they have a limited
	// validity time and GCM connection is a good indication of network running.
	// If the GetAllNeededTokens was called as part of periodic schedule, it may
	// not have network. In that case the next network change will trigger token
	// fetching.
	if (!driver_->IsConnected())
	return;

	for (AccountInfos::iterator iter = account_infos_.begin();
	iter != account_infos_.end();
	++iter) {
	if (iter->second.state == TOKEN_NEEDED)
	GetToken(iter);
	}
	}

	void GCMAccountTracker::GetToken(AccountInfos::iterator& account_iter) {
	DCHECK(GetTokenService());
	DCHECK_EQ(account_iter->second.state, TOKEN_NEEDED);

	OAuth2TokenService::ScopeSet scopes;
	scopes.insert(kGCMGroupServerScope);
	scopes.insert(kGCMCheckinServerScope);
	std::unique_ptr<OAuth2TokenService::Request> request =
	GetTokenService()->StartRequest(account_iter->first, scopes, this);

	pending_token_requests_.push_back(std::move(request));
	account_iter->second.state = GETTING_TOKEN;
	}

	void GCMAccountTracker::OnAccountSignedIn(const gaia::AccountIds& ids) {
	DVLOG(1) << "Account signed in: " << ids.email;
	AccountInfos::iterator iter = account_infos_.find(ids.account_key);
	if (iter == account_infos_.end()) {
	DCHECK(!ids.email.empty());
	account_infos_.insert(
	std::make_pair(ids.account_key, AccountInfo(ids.email, TOKEN_NEEDED)));
	} else if (iter->second.state == ACCOUNT_REMOVED) {
	iter->second.state = TOKEN_NEEDED;
	}

	GetAllNeededTokens();
	}

	void GCMAccountTracker::OnAccountSignedOut(const gaia::AccountIds& ids) {
	DVLOG(1) << "Account signed out: " << ids.email;
	AccountInfos::iterator iter = account_infos_.find(ids.account_key);
	if (iter == account_infos_.end())
	return;

	iter->second.access_token.clear();
	iter->second.state = ACCOUNT_REMOVED;
	ReportTokens();
	}

	OAuth2TokenService* GCMAccountTracker::GetTokenService() {
	DCHECK(account_tracker_->identity_provider());
	return account_tracker_->identity_provider()->GetTokenService();
	}

	} // namespace gcm